Tire-rim tool



NLA. EUBANK.

TIRE RIM TOOL.

APPLICATION FILED 00130, 1920.

1,42%,948, Patented July 18, 1922.

2 SHEETS-SHEET I.

T-LEJ- [hf/70? 060 )NVENTOR:

ATTORNEYi N. A. EUBANK.

TIRE RIM TOOL. APPLICATION FILED OCT. 30. 1920.

1. ,4Q2,948. Patented July 18, 1922.

2 SHEETSSHEET 2.

INVENTOR. 07/700 6. fuba/w.

ATTORNEYi UNITED STATES NATHAN A. EUEANK, OF NASHVILLE, TENNESSEE.

TIRE-RIM TOOL.

Specification of Letters Patent.

Patented July 18, 1922.

Application'filed October 30, 1920. Serial No. 420,723.

To all whom it may concern."

Be it known that I, NATHAN A. EUBANK, acitizen of the United States, residing at Nashville, in the county of Davidson and State of Tennessee, have invented new and useful Improvements in Tire-Rim Tools, of which the following is a specification.

This invention relates to tools designed for use in connection with pneumatic tire rims which are split 50 that they may be contracted and expanded for ready removal and replacement of the tire.

' The invention has for its object to provide a very efficient tool for contracting and expanding a rim of the kind stated, and also one which is easy to operate, and strong and durable in construction.

The objects stated are attained by means of a novel combination and arrangement of parts to be hereinafter described and claimed, and in order that the same may be better understood, reference is had'to the accompanying drawings forming a part of this specification.

In the drawings- Figure l is a side elevation of the tool; Fig. 2 is a plan view thereof; Fig. 3 is a cross-section on the line 3-3 of Fig. 2; Fig. 4 is front elevation of one of the rim-engaging hooks, partly broken away, Fig. 5 is a side elevation of said hook, and Fig. 6 is a detail showing a slight modification.

Referring specifically to the drawings 10' denotes a base consisting of a circular plate which is provided with legs 11 extending downwardly from its under side for supporting the device in proper operative position on the ground or on any other supporting surface, the base plate being held spaced from the latter by the legs.

The base plate '10 has a large central opening 12 and radiating from the latter are three grooves 13 made in the top of the plate and extending to the edge or periphery thereof. In each one of these grooves is slidably mounted an arm 14 of such length that its outer end is positioned outside the periphery of the base plate, and said arm having its outer end provided with a downturned hook 15. These armsextend radially with respect to the center of the base plate. and they are spaced equal-distances from each other. In order to prevent upward displzwement of the arms they are dovetail-shaped in cross-section, the grooves in which they slidably seat being correspondingly shaped.

e inner ends of the arms 14 project into the plane of the opening 12 in the base plate 10, .and over said opening is mounted a rotatable disk 16 which is held down on the base plate, and over the arms, by clips 17. carried by the base plate and overhangmg the disk at its periphery. From the center of the disk rises a stem 18 for the application of a suitable tool for rotating the disk, said tool being a socket wrench 19 having an operating handle 19 and carrymg a spring-actuated latch pin 20 passing nto the socket to enter a keeper aperture 21 in the stem 18, and thus lock the wrench to said stem.

The under side of the disl 16 has a spirally arranged groove 22 and -the arms 14 have teeth 23 on top which seat in said groove. It will therefore be seen that the arms are uniformly advanced or retracted when the disk is rotated, the rotation of the disk in one direction advancing the arms, and its rotation inthe opposite direction retracting the arms, the movement of the latter being radialwith respect to the center of the device. 7

When the device ,is used for contracting a tire nm 24 for removal. of the tire therefrom, the rim is placed to encircle the device and the arms 14 are adjusted to engage their hooks 15 over the rim edge. The disk 16 is now rotated to draw in or retract the arms 14, whereupon the rim is contracted by the ends at the split portion thereof being pulled inwardly until they overlap. To expand the rim, the arms 14 are adjusted to position their outer ends against the inner surface of the rim, and then upon operating the disk 16 to advance the arms outwardly the rim is expanded in an obvious manner to bring its ends together at the split portion.

It will be noted that two adjacent arms 14 are fitted at their outer ends with rollers 25 to bear against the rim 24 when it is bein expanded as hereinbefore described, thereby reducing friction to a minimum. The rim is placed so that the rollers 25 engage it on opposite sides of the split where the greatest movement of the rim occurs when it is being expanded to its true circular contour, the two ends of the rim here then also moving laterally in opposite direction. The arm M which is not fitted with a roller is positioned diametrically opposite the split where there is no side or lateral movement of the.

rim while it is being expanded.

The lateral movement of, the two ends of the rim 24: hereinbefore mentioned also takes place when the rim is being contracted, the two ends now moving toward each other so as to finally assume an overlapping position, and for this reason two of the hooks 15 are provided with pivoted terminals or points 26, the rim being placed so that these two hooks engage the rim on opposite sides of its split. The'terminals 26 are pivoted, as shown at 27 to swing laterally and thus follow the lateral movement of the rim ends. The hooks carrying the pivoted terminals 26 have'slots 28 in their ends to seat the inner ends of said terminal portions, and the inner endsot' the latter are beveled on opposite sides toabut against the inner end walls of the slots so as to limit the lateral swing and thus prevent said terminal portions from swinging laterally too far and thus slipping off the rim.

All the parts of the device are made of metal, and hence it is strong and durable, and by its use the operation of expanding or contracting a tire. rim for the purpose stated is easily and quickly eii'ected.

1 ,aaaeee Fig. 6 shows a slightly different shaped base plate 10*, the same being substantially triangular instead of circular, the purpose of this shape being to reduce the weight of the tool.

I claim:

1. A tire-rim tool comprising a base, radially movable arms carried by the base and having rim-engaging surfaces and depending hooks at their outer ends, the hooks of two adjacent arms having points which are pivoted to sv-ring laterally, a rotatable spirally grooved member mounted on the base over the arms, said arms having teeth seating in the grooves of said member, and means for rotating the grooved member.

A tire-rim tool comprising a base, radially movable arms carried by the base and having rim engaging surfaces and depending books at their outer ends, the hooks of two adjacent arms having points which are pivoted to swing laterally, means for limiting such swing, a rotatable spirally grooved member mounted on the base over the arms, said arms having teeth seating in the grooves of said member, and means for rotating the grooved member.

October 2, 1920.

LIATHAII EUBANK. 

